RST International is a technology oriented consulting firm specializing in travel demand model development, traffic simulations, activity-based models, GIS & GPS in Transportation applications, and transportation related information technologies. RST was founded in 1991 by Dr. Robert S. Tung with the philosophy of providing clients with state-of-the-art planning technologies which are innovative and cost-effective in solving transportation related technical issues.

RST is also the developer and publisher of two software products: UfosNet™ and DynuStudio™. UfosNet(Urban Form Optimization System Network) is a travel demand modeling system for multi-modal transportation and traffic planning. DynuStudio(Dynamic Urban Network Simulation System) is a dynamic traffic assignment modeling system built upon DynusT™ mesoscopic DTA engine.